﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Label3.Text = "欢迎来到这里 " + TextBox1.Text;
            if (this.TextBox1.Text=="")
            {
                Label3.Text = "不能为空";
            }
        }
    }
}